Many tax professionals and advisors recommend adjusting your W-4 what you owe in taxes matches what you are liable to pay. Your W-4 shows employers and the IRS what you can be withheld from regarding taxes and what is going to need to be taken out of your checks to make sure proper taxes are paid. Due to most not being held correctly, most people end up paying to much or too little which results in paying the IRS at the end of the fiscal year or getting a check reimbursed back.